Overview
The ZF 0737.502.084 SLOTTED NUT is a precision-engineered locking component designed to secure critical shaft assemblies within heavy-duty ZF transmissions. This OEM genuine part, identified by SKU 0737.502.084, functions as a positive-locking fastener that prevents axial displacement of gears and bearings under extreme torque loads. Located primarily on the output shaft or planetary carrier, this slotted nut works in concert with a cotter pin or tab washer to maintain preload tension. When installed correctly alongside the TRANSMISSION HOUSING, it ensures the entire rotating assembly remains rigidly aligned, preventing internal contact between moving parts.
Symptoms of Failure
- Transmission output shaft end-play or axial looseness: A worn or loosened slotted nut allows the shaft to shift, causing a distinct clunking noise during acceleration or deceleration.
- Intermittent gear slipping under load: When the nut loses its clamping force, the gear stack can separate slightly, leading to momentary power loss, especially in WG180 and WG200 series units.
- Oil seepage from the output flange area: Excessive shaft movement can distort the seal surface, resulting in slow, persistent oil leaks that contaminate the HOUSING cavity.
- Vibration at specific RPM ranges: Unbalanced preload from a failing nut creates harmonic vibrations that resonate through the driveline, often misdiagnosed as a bearing issue.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0737.502.084 |
| Type | Slotted Hexagon Nut (DIN 935 / ISO 4035) |
| Thread Size | M30 x 1.5 (estimated) |
| Width Across Flats | 46 mm |
| Material | Case-hardened steel, zinc-plated |
| Weight | 0.12 kg (0.26 lbs) |
| OEM Reference | ZF 0737.502.084 |
| Torque Spec | 180 Nm + cotter pin lock |
Compatibility
This slotted nut is a standard fitment across multiple ZF heavy-duty transmission families. It is commonly used in the WG180, WG200, and WG210 series, as well as certain Ecomat 4HP/5HP models where the output shaft requires a positive locking mechanism. It also appears in ZF 6S and 16S manual gearboxes for construction machinery. For proper sealing, always pair this nut with a new SCREW PLUG and verify the OIL LEVEL GAGE reading after reassembly to confirm correct fluid height.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101128 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4108201296 | HOUSING | Secondary housing for clutch/brake packs |
| 4475280018 | SCREW PLUG | Seals hydraulic passages |
| 0501215601 | OIL LEVEL GAGE | Dipstick for fluid level verification |
| 4108303034 | COVER | Protective cover for access port |
| 0636015120 | HEXAGON SCREW | Fastener for housing assembly |
| 0636302015 | SCREW PLUG | Drain/fill plug for oil circuit |
| 0501325471 | SEALING RING | Copper washer for leak-proof joints |
| 0730365280 | TYPE PLATE | Identification plate for transmission model |
| 4108108026 | INTERM.GEARBOX | Intermediate gearbox assembly |
Frequently Asked Questions
Q: Can I reuse the old slotted nut if it appears undamaged?
No. ZF engineering recommends replacing the 0737.502.084 nut whenever the shaft is disassembled. The locking slots can deform microscopically, reducing clamping force and risking future loosening.
Q: What torque should I apply to this nut?
Torque to 180 Nm, then advance the nut to align the nearest slot with the cotter pin hole. Never back off the nut to align slots—this indicates incorrect shim selection or worn threads.
Q: Does this nut fit both WG180 and WG200 transmissions?
Yes. The M30 x 1.5 thread and 46mm hex size are common across both series. However, always verify the output shaft thread pitch on your specific unit before installation.
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